Add PlatformFrameView class.

third_party/WebKit/Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 2765 matching lines @@
   if (!frame_->IsMainFrame())
     return;
   AdjustScrollbarOpacity();
   ContentsResized();
   UpdateScrollbars();
   PositionScrollbarLayers();
 }
 
 bool FrameView::ScheduleAnimation() {
   if (PlatformChromeClient* client = GetChromeClient()) {
-    client->ScheduleAnimation(frame_);
+    client->ScheduleAnimation(this);
     return true;
   }
   return false;
 }
 
 void FrameView::NotifyPageThatContentAreaWillPaint() const {
   Page* page = frame_->GetPage();
   if (!page)
     return;
 
@@ skipping 2591 matching lines @@
 void FrameView::SetAnimationHost(
     std::unique_ptr<CompositorAnimationHost> host) {
   animation_host_ = std::move(host);
 }
 
 LayoutUnit FrameView::CaretWidth() const {
   return LayoutUnit(GetChromeClient()->WindowToViewportScalar(1));
 }
 
 }  // namespace blink